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Abe Eisenstark

The predator sends a message, "are you friend or foe?" If foe, the predator recognizes foe via peptide/polysaccharide, and attacks. This is what phage and other predators have in common. See papers by Bettelheim who explains friend/foe recognition.

Colony incompatibility studies of enterotoxigenic Escherichia coli O126 isolated during one outbreak.
Bettelheim KA.
J Clin Microbiol. 1984 Mar;19(3):408-11.

Colony incompatibility in bacteria.
Bettelheim KA, Carlile MJ.
Nature. 1976 Dec 23-30;264(5588):757-8. No abstract available.

See also Prophage contribution to bacterial population
Bossi, et al.
J. Bacteriology 2003 185: 6461-71.

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